10mm info to share?

[kerreckt]

I just bought another 10mm (Glock 20sf) and now that I have a couple of 10mm the other is a Tanfoglio. I want to work up some full power 10mm loads. If, you have any info you wish to share I will appreciate it. I have some lower power loads but am interested in loads that take full advantage of the 10mm potential. Thanks and best wishes.

 

[Ex]

800X will give you probably THE best velocity but it meters like cornflakes! End up hand weighing every charge to keep it consistant.

LongShot is very close and flows REAL nice though most dispensers. I have now switched to LongShot in most rounds that I load.

I shoot my 10mm rounds in either a G20 or G29, both Gen3. Remember that Glock barrels are not "fully supported" so if loading hot,
you will have substantial case bulge at the bottom and shorten the useful life of your brass. Can't speak to the design of the Tangfolio
chamber design.

 

[osteodoc08]

8 gr of Longshot behind a 200gr XTP gives me 1100fps out of a G20sf. Good enough for woods or social work. 800x will give you slightly higher velocity but is a PITA to meter accurately for me.

Blue Dot is also a personal favorite.

 

[wlkjr]

All my hot loads come from Underwood and my target loads I do myself. I love the G29. It will cycle a ligher load than my G20 with compensator.

 

[mulyhuntr]

Give longshot a try as mentioned above. I'd also recommend a lone wolf barrel for full power loads. I was getting the glock smile with my stock gen 4 barrel, not so with the lone wolf.

 

[41 Mag]

I get my best groups and velocities using AA-9 under the 180gr Gold Dot. This combo shoots plenty accurate and hits plenty hard enough for anything I need a handgun for.

 

[steve4102]

Longshot, but work up the load over a chrony.

Hodgdon lists 9.5gr as Max for the 180gr bullet. Using a chrony I found that 9.2gr gave max velocity. Anything above 9.2gr and velocities would gradually decrease.

 

[ATLDave]

AA7 and AA9 are both very good full 10mm powders (AA9 slightly better esp. with heavier bullets, IIRC) and both meter as well as anything. AA9 gives better case fill, AA7 does better with reduced loads.

 

[ATLDave]

I shoot my 10mm rounds in either a G20 or G29, both Gen3. Remember that Glock barrels are not "fully supported" so if loading hot,
you will have substantial case bulge at the bottom and shorten the useful life of your brass. Can't speak to the design of the Tangfolio
chamber design.

Tanfoglio's have excellent case support (at least in the Match 10mm's I have had). Many have the view that they come under-sprung. If you believe that recoil springs have anything to do with slide velocity, timing of breach opening, and/or slide/frame battering, you may want to drop in a heavier recoil spring. Henning sells Wolff springs up to 20lbs.

 

[Havok7416]

AA9 and 180 grain bullets work well for me, but I shoot a 610 and a 1006 in 10mm. With a Glock I'm not so sure since it doesn't fully support the case. I have had to discard more than a few 10mm cases I have found that were fired from a Glock.

 

[Dr. A]

I use AA #9 and Longshot. Most 40 caliber bullets will over expand using the higher velocities this caliber drives them too, so I concentrated my efforts on xtp 180 and 200gr. bullets along with the hard cast a lot of us hunters like to use. The glock cases do have the smile if you load up higher pressures and if you want to use your brass a little longer, I would suggest a good aftermarket barrel. The best bullets for penetration on larger animals will be a 180 or bigger WFN. That is a wide flat nose. Loading these into the mag needs to be done with care. Mine generally do not fill the full capacity of a larger mag because of the nose size. Also, the wide flat nose may decrease reliability. I modified mine to be more reliable by opening the chamber somewhat. I believe Lone Wolf has opened their chamber somewhat since I had to do this.

 

[Match10]

AA7 and AA9 are both very good full 10mm powders (AA9 slightly better esp. with heavier bullets, IIRC) and both meter as well as anything. AA9 gives better case fill, AA7 does better with reduced loads.

Bingo... AA #7 and AA #9.

 

[kerreckt]

Thanks to everyone for their advice and suggestions. I have ordered a Lone Wolf barrel and heavier springs/guide for the Glock from Wolff. I put a 20lb spring in the Tanfoglio shortly after I started shooting it and I feel it was an improvement. Best wishes for the new year

 

[Peter M. Eick]

I went with a KKM barrel over lone wolf but I don't think it matters much. I just liked the 6" with the comp.

All full power loads fro me are 800x loads. I get very repeatable results out of my uniflow with it so it is my go to powder for 10mm. I just bought 8 more lbs of it since it is so easy to work with.

I used to load AA7 but it is a bit fast for full power. AA9 is better but it is a touch slow I think. Better for the 357 Sig. Longshot works but I don't like ball powders in general. While fine for the glock, they are hard on revolvers so I tend to avoid them.

Good luck. The 10mm is a lot of fun to play with and you have two good choices.

 

[Elkins45]

Why are ball powders bad for revolvers?

 

[Peter M. Eick]

Well the issue is the ball powders in and of themselves. Picture what happens on a hot load with ball powders. As the powder burns at say 4000 F (give or take a thousand F or so) the bullet moves forward out of the cylinder. That powder is now getting progressively smaller as it burns and is obviously very hot.

Now as the bullet base crosses between the cylinder and the barrel it opens up cylinder gap and although Bernoulli's principals state most of the pressure will continue down the barrel there is some that will blast off the sides and blow that now hot little spheres of burning powder everywhere at high velocity.

The problem is the powder "sand blasts" the frame above the gap and tends to "flame cut" the frame. I don't believe most of the damage is caused by flames but by the "sand blast" effect of the burning powder on the frame.

This is a minimal issue if you shoot say 38 special, 45 colt or other low pressure rounds. But get into the 357 Maximum, 357 Magnum, or even the 10mm you can get this sand blasting going on and "flame cut" your top strap.

I avoid (if I can) ball powders in any revolver caliber. They are fine in semi's but in concept they would do the same thing on the leade.